ipv4-mapped reverse lookups

Mark Andrews marka at isc.org
Mon Jul 8 22:27:43 UTC 2013

Getnameinfo and gethostbyaddr are supposed to lookup the in-addr.arpa records instead of ip6.arpa records for mapped addresses. If you only have a limited range of addresses one could use $generate to add cname records which map from ip6.arpa to in-addr.arpa.


On 09/07/2013, at 8:12, "Lawrence K. Chen, P.Eng." <lkchen at ksu.edu> wrote:

> For reasons unknown, some old Solaris servers are suddenly seeing connections to them as ipv4-mapped ipv6 (ie: ::ffff: )  Which is causing problems because it needs the reverse lookup to be right.
> So while we struggle between spending time to investigate why or continue to try to get people to upgrade from these old forgotten servers.
> Is there an easy way for me to provide reverse lookups for those?
> -- 
> Who: Lawrence K. Chen, P.Eng. - W0LKC - Senior Unix Systems Administrator
> For: Enterprise Server Technologies (EST) -- & SafeZone Ally
> Snail: Computing and Telecommunications Services (CTS)
> Kansas State University, 109 East Stadium, Manhattan, KS 66506-3102
> Phone: (785) 532-4916 - Fax: (785) 532-3515 - Email: lkchen at ksu.edu
> Web: http://www-personal.ksu.edu/~lkchen - Where: 11 Hale Library
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